EP0059689B1 - Intégrateur de pré-ionisation avec commutateur à haute-tension pour laser à gaz pulsée - Google Patents
Intégrateur de pré-ionisation avec commutateur à haute-tension pour laser à gaz pulsée Download PDFInfo
- Publication number
- EP0059689B1 EP0059689B1 EP82830026A EP82830026A EP0059689B1 EP 0059689 B1 EP0059689 B1 EP 0059689B1 EP 82830026 A EP82830026 A EP 82830026A EP 82830026 A EP82830026 A EP 82830026A EP 0059689 B1 EP0059689 B1 EP 0059689B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- gas
- switch
- terminal
- gas laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/097—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser
- H01S3/0971—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser transversely excited
- H01S3/09713—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser transversely excited with auxiliary ionisation, e.g. double discharge excitation
Definitions
- the present invention relates to a pulsed gas laser in accordance with the prior art portion of claim 1.
- a discharge being periodically generated by a pair of excitation electrodes may become unstable and irregular, changing from a uniform glow to localized discharging arcs inhibiting the laser effect.
- auxiliary discharge circuits for pre-ionizing the gas contained in the laser cavity.
- Such an auxiliary discharge circuit serves for emitting radiation that ionizes the gas before the main discharge between said pair of excitation electrodes occurs.
- lasers require two separate electric pulse discharges, namely a first discharge for preionizing the gas and a second discharge for exciting the gaseous mixture and for obtaining the laser effect.
- prior art lasers require two separate switches, working at high voltages and high currents in the order of some hundreds of Amperes.
- FIG. 1A A prior artgas laser of the above-mentioned kind is shown in Fig. 1A.
- FIG. 1 B Another prior art laser is shown i.n Fig. 1 B.
- This gas laser comprises a pair of excitation electrodes and a pumping capacitor.
- An auxiliary discharge circuit connected in series to a resistor, is connected to one excitation electrode, while the other excitation electrode and the other terminal of said resistor are commonly connected to ground.
- the pumping capacitor is connected to the common node between said auxiliary discharge circuit and said resistor.
- the second temrinal of this pumping capacitor is connected to a high current, high voltage switch which is adapted for connecting said pumping capacitor to a charging circuit or, alternatively thereto, to ground.
- a high pressure gas laser comprising a long ceramic capacitor which is used as one of the discharge electrodes is known.
- connection is made to a conducting plate at one side of a dielectric, while the gas discharge takes place at the other side of the dielectric having no conducting plate. The absence of any conducting plate prevents the entire charge from being discharged from one point.
- This prior art gas laser comprises a pair of excitation electrodes and one pre-ionizing member located near the discharge space between the excitation electrodes and extending between these electrodes.
- the pre- ionizing member is made of semi-conductive material and is directly connected to the excitation electrodes.
- a current flows in said preionizing member generating a plurality of small arcs between the excitation electrodes and the member.
- a further gas laser is described in "Optics Communications", November 1977, Volume 23, Number 2, pages 183 to 186.
- a circuit diagram of this prior art gas laser is shown at Fig. 1 and described at page 184, left column.
- a pulse generating system is coupled to two separate trigger spark-gaps, which, in turn, are coupled to two capacitors C1, C2. These capacitors are connected to a sliding-sparkarrayforming an auxiliary discharge circuit for pre-ionizing the gas in the laser cavity.
- the control circuitry of this prior art gas laser requires two triggered spark-gaps and one additional high voltage, high current switch which can have the form of a thyratron.
- the present invention is based on the object to provide a gas laser in accordance with the prior art portion of claim 1 so that it has a more reliable, simplifed and compact circuit design.
- a gas laser according to the features of claim 1 brings about the specific advantage of an integration of the pre-ionizing with the H.T. switch.
- the pre-ionization is obtained in this switch by a series of discharges which occur between the endpoints of a number of metal rings placed on an insulating tubular element.
- a metal electrode being fed with a control pulse is arranged within this insulating tubular element.
- the metal rings form a capacitive divider.
- the same trigger which is normally fed to the spark-gaps controls the pre-ionization internal electrode; the unbalancing of the electricfield atthe ends of the single electrodes causes this type of multiple spark-gap to close so that the pump condenser C, is connected to the electrodes of the laser causing the discharge in the gas.
- the pump capacitor C 1 connected in series with the H.T. switch also functions for pre-ionization (see detail of the pre-ionization shown in Fig. 1C).
- the output of this device is connected to a step-up autotransformer, in its turn being connected to TEA laser electrodes.
- a peaking capacitor C 2 placed across the electrodes serves only for the optimization of the laser performance.
- the resistor R allow the pump capacitor C 1 which is connected to the H.T. pre-ionizing switch to be charged.
- the switch is formed of a series of capacitors distributed along an insulating support; in static conditions, the said capacitors distribute the applied potential uniformly.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT4785181 | 1981-02-20 | ||
IT47851/81A IT1170739B (it) | 1981-02-20 | 1981-02-20 | Integratore di preionizzazione con interruttore a.t. per laser a gas impulsato |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0059689A1 EP0059689A1 (fr) | 1982-09-08 |
EP0059689B1 true EP0059689B1 (fr) | 1988-06-29 |
Family
ID=11262937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82830026A Expired EP0059689B1 (fr) | 1981-02-20 | 1982-02-08 | Intégrateur de pré-ionisation avec commutateur à haute-tension pour laser à gaz pulsée |
Country Status (4)
Country | Link |
---|---|
US (1) | US4450566A (fr) |
EP (1) | EP0059689B1 (fr) |
DE (1) | DE3278731D1 (fr) |
IT (1) | IT1170739B (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3136447A1 (de) * | 1981-09-14 | 1983-03-24 | Kraftwerk Union AG, 4330 Mülheim | Laser des te-typs, insbesondere hochenergielaser |
DE3621005C2 (de) * | 1986-06-23 | 1993-12-09 | Lambda Physik Gmbh | Schaltung für eine autonome Vorionisierung in einem gepulsten Gaslaser |
US4905250A (en) * | 1987-11-13 | 1990-02-27 | The European Atomic Energy Community | Pre-ionizing electrode arrangement for a gas discharge laser |
JPH02248094A (ja) * | 1989-03-22 | 1990-10-03 | Toshiba Corp | X線予備電離パルスレーザー装置 |
DE19611679C2 (de) * | 1996-03-25 | 2001-10-31 | Deutsch Zentr Luft & Raumfahrt | Fremdgezündete Gasentladungsvorrichtung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3828277A (en) * | 1971-12-27 | 1974-08-06 | Us Army | Integral capacitor lateral discharge laser |
JPS6344308B2 (fr) * | 1978-10-20 | 1988-09-05 | Yunibaasutei Obu Esetsukusu | |
US4262267A (en) * | 1979-08-27 | 1981-04-14 | The United States Of America As Represented By The Secretary Of The Navy | Performance of metal dehalide dissociation lasers by changed buffer gas composition |
US4342114A (en) * | 1980-02-04 | 1982-07-27 | Raytheon Company | TEA Laser configuration |
US4380079A (en) * | 1980-09-12 | 1983-04-12 | Northrop Corp. | Gas laser preionization device |
-
1981
- 1981-02-20 IT IT47851/81A patent/IT1170739B/it active
-
1982
- 1982-02-08 EP EP82830026A patent/EP0059689B1/fr not_active Expired
- 1982-02-08 DE DE8282830026T patent/DE3278731D1/de not_active Expired
- 1982-02-17 US US06/349,513 patent/US4450566A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
IT8147851A0 (it) | 1981-02-20 |
IT1170739B (it) | 1987-06-03 |
DE3278731D1 (en) | 1988-08-04 |
EP0059689A1 (fr) | 1982-09-08 |
US4450566A (en) | 1984-05-22 |
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